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   M.A. Baskind Company (Pittsburgh, Pa.)   4 items
   M.H. Danzinger Co. (Pittsburgh, Pa.)   2 items
   M.H. Pickering Company (Pittsburgh, Pa.)   2 items
   M.W. Sackett and Co. (Pittsburgh, Pa.)   2 items
   MAGLEV, Inc. (Pittsburgh, Pa.)   2 items
   MacVay Printing Company.   2 items
   Macbeth-Evans Glass Company.   12 items
   Machine guns. -- World War II.   2 items
   Machsikei Hadas Congregation (Pittsburgh, Pa.)   6 items
   Mackintosh-Hemphill Company.   6 items
   Madison College (Uniontown, Fayette County, Pa.)   2 items
   Madison County Historical Society (Ky.)   2 items
   Madonna del Castello Church (Swissvale, Pa.)   2 items
   Madonna del Castello Parish (Swissvale, Pa.)   2 items
   Magee Women's Hospital (Pittsburgh, Pa.).   8 items
   Maine Historical Society -- Periodicals.   2 items
   Maine Historical Society.   2 items
   Major League Baseball (Organization)   2 items
   Malcolm Leech and Co. (Pittsburgh, Pa.)   2 items
   Manallen Coke Company (New Salem, Pa.)   4 items
   Manchester Bridge (Pittsburgh, Pa.) -- Photographs.   4 items
   Manchester Citizens Corporation (Pittsburgh, Pa.)   2 items
   Manchester Presbyterian Church (Pittsburgh, Pa.)   4 items
   Manchester Presbyterian Church (Pittsburgh, Pa.) -- Photographs.   2 items
   Manchester Reformed Presbyterian Church Cemetery (Milliga ntown, Pa.)   2 items
   Mancini's Bakery (McKees Rocks, Pa.)   2 items
   Manhattan Life Insurance Company.   2 items
   Mansfield Herbarium.   2 items
   Mansmann's Company (East Liberty (Pittsburgh, Pa.))   2 items
   Manufacturers Association of Pittsburgh.   2 items
   Manufacturers Trade Mark Association.   2 items
   Maple Avenue Hospital Training School (DuBois, Pa.)   2 items
   Maple Avenue Hospital Training School (DuBois, Pa.) -- Students -- Yearbooks.   2 items
   Maple Grove Mennonite Church (New Wilmington, Pa.)   2 items
   Marathon Oil Company.   2 items
   Marathon Oil Foundation.   2 items
   Marcel Breuer Associates (New York, N.Y.)   2 items
   March of Dimes (Pittsburgh, Pa.)   2 items
   Marcus Hook, Camp, Pa.   2 items
   Marine Historical Society of Detroit.   2 items
   Marionette Arts Theatre Council (Pittsburgh, Pa.)   2 items
   Marjorie Webster Schools (Washington, D.C.)   2 items
   Market House (North Side (Pittsburgh, Pa.) -- Photographs.   4 items
   Market Street Mission (Pittsburgh, Pa.)   2 items
   Markle Academy (Markle, Pa.)   2 items
   Markley Freundschaft (Montgomery Co., Pa.)   2 items
   Marlborough Fine Art (London) Ltd.   2 items
   Marshall Elevator Company (Pittsburgh, Pa.)   4 items
   Marshall Field & Company   6 items
   Marshall, Kennedy & Co. (Pittsburgh, Pa.)   2 items
   Martin Shorthand School (Pittsburgh, Pa.)   2 items
   Martinez & Murphey.   2 items
   Marvin Biscuit Works (Pittsburgh, Pa.)   1 item
   Mary Means & Associates, Inc.   2 items
   Mary S. Brown Memorial Methodist Church (Pittsburgh, Pa.)   2 items
   Mary S. Brown Memorial Methodist Episcopal Church (Pittsburgh, Pa.)   2 items
   Mary S. Brown-Ames Memorial United Methodist Church (Pittsburgh, Pa.)   1 item
   Mary's Grocery Store (Pittsburgh, Pa.)   2 items
   Maryland Historical Society -- Catalogs.   4 items
   Maryland Historical Society.   10 items
   Maryland Historical Society. -- Library -- Finance.   2 items
   Maryland Historical Society. -- Museum -- Finance.   2 items
   Maryland Instructional Technology.   2 items
   Maryland Magazine.   2 items
   Maryland. -- General Assembly -- Biography -- Dictionaries.   2 items
   Maryland. -- General Assembly -- History.   2 items
   Maryland. -- Governor (1848-1851 : Thomas)   2 items
   Maryland. -- Militia -- Registers.   2 items
   Masonic Fund Society for the County of Allegheny.   2 items
   Masonic Temple (Pittsburgh, Pa.)   4 items
   Massachusetts General Hospital. -- Social Service Dept.   2 items
   Massachusetts Institute of Technology -- Alumni and alumnae -- Biography.   2 items
   Massachusetts Institute of Technology. -- School of Mechanic Arts. -- Class of 1886 -- Alumni and alumnae -- Directories.   4 items
   Massachusetts Institute of Technology. -- School of Mechanic Arts. -- Class of 1886.   4 items
   Massachusetts. -- Governor (1741-1757 : Shirley)   2 items
   Massachusetts. -- Superior Court (Norfolk Co.)   2 items
   Master Brewers Association of America.   2 items
   Master Brewers of Western Pennsylvania.   2 items
   Master Visual Artists.   2 items
   Matthews & Co. (Pittsburgh, Pa.)   2 items
   Maumee Valley Historical Society.   2 items
   Maurice Falk Medical Fund.   2 items
   Maurice and Laura Falk Foundation -- Periodicals.   2 items
   Maurice and Laura Falk Foundation.   4 items
   Max Kade German-American Center (Indiana University-Purdue University at Indianapolis)   2 items
   Max Klein Wholesale Liquors (Pittsburgh, Pa.)   2 items
   May Beegle Concerts (Pittsbrugh, Pa.)   2 items
   May Department Stores Company -- Periodicals.   2 items
   May Department Stores.   4 items
   May Drug Company (Pittsburgh, Pa.)   2 items
   May Music Festival (Pittsburgh, Pa.)   2 items
   Mayer Field (Pa.)   2 items
   Mayer Field (Pa.) -- Photographs -- 1928.   2 items
   Mayer Press (Pittsburgh, Pa.)   2 items
   Mayer Publishing and Printing Company (Pittsburgh, Pa.)   2 items
   Mayfair Hotel (Pittsburgh, Pa.).   2 items
   Mayflower (Ship)   2 items
   Mayor's Commission of Human Relations (Pittsburgh, Pa.)   2 items
   Mayor's Task Force on Women (Pittsburgh, Pa.)   2 items
   Mays' Forks Stagecoach Inn (Pa.)   2 items
   Mayview Home and Hospital (Mayview, Pa.)   8 items
   Mayview Hospital (Pittsburgh, Pa. )   2 items
   McBride Sign Company (Pittsburgh, Pa.)   2 items
   McCandless, Jamison and Co. (Pittsburgh, Pa.)   2 items
   McCann and Co. (Pittsburgh, Pa.)   2 items
   McCann and Co. (Pittsburgh, Pa.) -- Butter Department -- Photographs.   2 items
   McCann and Co. (Pittsburgh, Pa.) -- Meat Department -- Photographs.   2 items
   McCann and Co. (Pittsburgh, Pa.) -- Produce Department -- Photographs.   2 items
   McClure Club (Pittsburgh, Pa.)   2 items
   McClurg and Co. (Pittsburgh, Pa.)   2 items
   McConnells Mill State Park (Pa.)   2 items
   McCord and Co. (Wholesale merchants : Pittsburgh, Pa.)   2 items
   McCorkle Cemetery (Indiana (Township : Allegheny County, Pa.))   2 items
   McCormick Theological Seminary.   4 items
   McCormick Theological Seminary. -- Virginia Library.   2 items
   McCoy Brothers Coach Lines (Turtle Creek, Pa.)   2 items
   McCreery and Co. (Pittsburgh, Pa.)   2 items
   McCune Foundation.   2 items
   McDonalds Corporation.   1 item
   McElroy and Dickson (Dry-goods firm : Pittsburgh, Pa.)   2 items
   McEwan Open School.   2 items
   McGaughey Trucking Company (Pittsburgh, Pa.)   2 items
   McIllhenny & Co.   2 items
   McIntyre Shelter (Pittsburgh, Pa.)   2 items
   McKay Lodge Fine Arts Conservation Laboratory, Inc. -- Periodicals.   2 items
   McKean and Elk Land and Improvement Company   2 items
   McKee & Brothers -- Catalogs.   2 items
   McKee Cemetery (Hempfield (Township : Westmoreland County, Pa.))   2 items
   McKee Glass Company (Jeannette, Pa.)   6 items
   McKee Glass Company (Southside (Pittsburgh, Pa.))   2 items
   McKee Jeannette Glass Works (Jeannette, Pa.)   2 items
   McKee Place School (Pittsburgh, Pa.)   2 items
   McKee and Bryce Glass Company (Pittsburgh, Pa.)   2 items
   McKee and Company (Pittsburgh, Pa.)   2 items
   McKees Rocks High School (McKees Rocks Pa.) -- Students -- Yearbooks.   2 items
   McKees Rocks High School (Pa.) -- Periodicals.   2 items
   McKees Rocks Religious School.   2 items
   McKeesport (Pa.). -- Chamber of Commerce.   2 items
   McKeesport (Pa.). -- Committee on Centennial Celebration.   2 items
   McKeesport High School (McKeesport, Pa.) -- Students -- Yearbooks.   2 items
   McKeesport Lodge of B'nai Brith (Pa.)   2 items
   McKeesport Oil and Drilling Company.   2 items
   McKeesport Oral History Project.   2 items
   McKeesport and Belle Vernon Railroad Company.   2 items
   McKeesport and Belle Vernon Railroad.   2 items
   McKeesport and Versailles Cemetery (Pa.)   2 items
   McKeesport, Pa. -- First Methodist Church.   2 items
   McKinley Commemoration Club (Pittsburgh, Pa.)   2 items
   McKinney Manufacturing Company (Pittsburgh, Pa.)   4 items
   McKissick Museum.   2 items
   McLean and McGuiness (Pittsburgh, Pa.)   2 items
   McMahon and Co. (Pittsburgh, Pa.)   2 items
   McMillan Log School (Pittsburgh, Pa.)   2 items
   McVay, Walker and Co. (Braddock, Pa.)   2 items
   Meade Monument (Washington, D.C.)   2 items
   Meadow Gold (Pittsburgh, Pa.)   2 items
   Meadow Mining Company of Pittsburgh.   2 items
   Meadowcroft Museum of Rural Life (Pa.)   4 items
   Meadowcroft Rockshelter (Pa.)   6 items
   Meadowgold Dairy (Pittsburgh, Pa.)   2 items
   Meadows (Race track : Pa.)   2 items
   Meadville (Pa.). -- Independent Congregational Church.   2 items
   Mechanics Institute (Pittsburgh, Pa.)   2 items
   Medical Society of the State of Pennsylvania.   4 items
   Medical Society of the State of Pennsylvania. -- Woman's Auxiliary.   2 items
   Mellon Bank -- History.   4 items
   Mellon Bank Corporation -- Periodicals.   2 items
   Mellon Bank Corporation.   4 items
   Mellon Bank Foundation.   2 items
   Mellon Bank.   14 items
   Mellon Brothers (Pittsburgh, Pa.)   2 items
   Mellon Institute   6 items
   Mellon Institute of Industrial Research.   2 items
   Mellon National Bank and Trust Company   2 items
   Mellon Square (Pittsburgh, Pa.)   1 item
   Mellon, R.B.   2 items
   Mendelssohn Choir of Pittsburgh.   2 items
   Mendelssohn Male Choir.   2 items
   Mendelssohn Quintette Club (Boston, Ma.)   2 items
   Mennonite General Conference. -- Historical Committee.   2 items
   Mennonite General Conference. -- Historical and Research Committee.   2 items
   Mennonite Historical Association.   2 items
   Mennonite Publishing House (Scottdale, Pa.)   4 items
   Mercantile Club (Pittsburgh, Pa.)   2 items
   Mercantile Library Association (Pittsburgh, Pa.)   2 items
   Mercer Automobile Company.   2 items
   Mercer County Genealogical Society (Pa.)   2 items
   Mercer County Historical Society (Pa.)   8 items
   Mercer County Historical Society (Pa.) -- Periodicals.   2 items
   Mercer County Historical Society.   2 items
   Mercer School (Pa.)   2 items
   Mercersburg Academy   2 items
   Merchants and Manufacturers Association (Pittsburgh, Pa.)   2 items
   Merck & Co. -- Periodicals.   2 items
   Mercy Hospital (Pittsburgh, Pa.)   10 items
   Mercy Hospital (Pittsburgh, Pa.) -- History.   6 items
   Mercy Hospital (Pittsburgh, Pa.) -- Periodicals.   2 items
   Mercy Hospital (Pittsburgh, Pa.) -- cn   2 items
   Mercyhurst College.   4 items
   Mesheck Browning Fishing and Hunting Club.   2 items
   Mesivta (Pittsburgh, Pa.)   2 items
   Messer Candy Company (Pittsburgh, Pa.)   2 items
   Messiah Lutheran Church (Munhall, Pa.)   2 items
   Mesta 160" Plate Mill (Homestead, Pa.)   2 items
   Mesta Machine Co.   2 items
   Mesta Machine Company (Pittsburgh, Pa.)   14 items
   Mesta Machine Company -- Periodicals.   2 items
   Metaform Inc.   2 items
   Metalar.   2 items
   Metallurgical Society of AIME.   2 items
   Metallurgical Society of AIME. -- Light Metals Committee.   2 items
   Metallurgical Society of AIME. -- Meeting.   2 items
   Methodist Church (U.S.)   5 items
   Methodist Church (U.S.) -- Hymns.   1 item
   Methodist Church (U.S.) -- Pennsylvania -- Jumonville.   2 items
   Methodist Church (U.S.) -- Pennsylvania -- Periodicals.   2 items
   Methodist Church (U.S.). -- Pittsburgh Conference -- History.   2 items
   Methodist Church (U.S.). -- Pittsburgh Conference.   10 items
   Methodist Church (U.S.). -- Pittsburgh Conference. -- Historical Society.   2 items
   Methodist Church (U.S.). -- Western Pennsylvania Conference -- Periodicals.   2 items
   Methodist Church. -- Conferences. -- Ohio.   2 items
   Methodist Episcopal Church   6 items
   Methodist Episcopal Church (Wilkinsburg, Pa.)   2 items
   Methodist Episcopal Church -- Clergy -- Biography.   2 items
   Methodist Episcopal Church -- Clergy -- Genealogy.   2 items
   Methodist Episcopal Church -- Clergy.   4 items
   Methodist Episcopal Church -- Education.   2 items
   Methodist Episcopal Church -- Government.   2 items
   Methodist Episcopal Church -- History   8 items
   Methodist Episcopal Church -- Hymns.   4 items
   Methodist Episcopal Church -- Missions -- Societies, etc. -- History.   2 items
   Methodist Episcopal Church -- Missions.   1 item
   Methodist Episcopal Church -- Pennsylvania -- Bellevue.   8 items
   Methodist Episcopal Church -- Pennsylvania -- Crafton.   2 items
   Methodist Episcopal Church -- Pennsylvania -- History -- Sources -- Bibliography.   2 items
   Methodist Episcopal Church -- Pennsylvania -- History.   2 items
   Methodist Episcopal Church -- Pennsylvania -- Ingomar.   2 items
   Methodist Episcopal Church -- Pennsylvania -- McKeesport.   2 items
   Methodist Episcopal Church -- Pennsylvania -- Meadville.   2 items
   Methodist Episcopal Church -- Pennsylvania -- Munhall.   2 items
   Methodist Episcopal Church -- Pennsylvania -- Periodicals.   2 items
   Methodist Episcopal Church -- Pennsylvania -- Pittsburgh.   14 items
   Methodist Episcopal Church -- Pennsylvania -- Tarentum.   2 items
   Methodist Episcopal Church -- Pennsylvania -- Wilkinsburg.   2 items
   Methodist Episcopal Church -- Pennsylvania.   4 items
   Methodist Episcopal Church -- Periodicals.   2 items
   Methodist Episcopal Church -- Sermons.   2 items
   Methodist Episcopal Church -- Southwest, Old -- History.   2 items
   Methodist Episcopal Church Union (Pittsburgh, Pa.)   2 items
   Methodist Episcopal Church of East Birmingham (Pittsburgh, Pa.)   4 items
   Methodist Episcopal Church. -- Annual Conference -- (1841 : -- Pittsburgh, Pa.) -- Trials, litigation, etc.   2 items
   Methodist Episcopal Church. -- Board of Education.   2 items
   Methodist Episcopal Church. -- Committee on Conservation and Advance.   1 item
   Methodist Episcopal Church. -- Conferences. -- Western Pennsylvania -- Archives.   2 items
   Methodist Episcopal Church. -- General Conference.   2 items
   Methodist Episcopal Church. -- Pittsburgh Conference -- Directories.   2 items
   Methodist Episcopal Church. -- Pittsburgh Conference -- History.   4 items
   Methodist Episcopal Church. -- Pittsburgh Conference -- Periodicals.   2 items
   Methodist Episcopal Church. -- Woman's Foreign Missionary Society -- History.   2 items
   Methodist Episcopal church -- Ohio -- History.   2 items
   Methodist Episcopal church -- Ohio.   4 items
   Methodist Female College (Pittsburgh, Pa.)   2 items
   Methodist Hospital and Home for the Aged (Mt. Lebanon, Pa.)   2 items
   Methodist Hospital and Home for the Aged (Pittsburgh, Pa.) -- Periodicals.   4 items
   Methodist Protestant Church. -- Pittsburgh Conference.   2 items
   Metropolitan Museum of Art (New York, N.Y.)   4 items
   Metropolitan Museum of Art (New York, N.Y.). -- American Wing.   2 items
   Metropolitan Museum of Art (New York, N.Y.). -- Division of Educational Services   2 items
   Metropolitan Opera Guild.   2 items
   Metropolitan Pittsburgh Public Broadcasting, inc.   6 items
   Metropolitan Pittsburgh Public Broadcasting, inc. -- Periodicals.   2 items
   Metropolitan Sausage Company (Pittsburgh, Pa.)   2 items
   Metropolitan life insurance co. -- Advisory committee on burial survey.   2 items
   Mexico. -- Declaration of Independence -- Exhibitions.   2 items
   Miami County Historical Society (Ohio)   2 items
   Miami Union Literary Society (Oxford, Ohio)   2 items
   Miami University (Oxford, Ohio)   4 items
   Miceli Tailors (Sewickley, Pa.)   2 items
   Michael J. Hindelang Criminal Justice Research Center.   2 items
   Michael L. Benedum Hall of Engineering (Pittsburgh, Pa.)   2 items
   Michigan Historical Commission.   2 items
   Michigan Pioneer and Historical Society. -- Historical collections.   2 items
   Michigan State Historical Society.   2 items
   Michigan State Historical Society. -- Michigan historical collections.   2 items
   Michigan. -- Mackinac Island State Park Commission.   2 items
   Microsoft Corporation   4 items
   Mid Mon Valley All Sports Hall of Fame (California, Pa.)   2 items
   Mid-Atlantic ADA Information Center.   2 items
   Mid-Atlantic Association of Museums   2 items
   Mid-Atlantic Regional Archives Conference.   14 items
   Middle Presbyterian Church (Mount Pleasant, Pa.)   2 items
   Middle Sandy Presbyterian Church (Homeworth, Ohio)   2 items
   Middle Spring Presbyterian Church (Middle Spring, Pa.) -- History.   2 items
   Middlebrook Church (Greenfield, Pa.)   2 items
   Midland Enterprises Inc.   2 items
   Midwest Modern Language Association. -- Folklore Section.   2 items
   Midwest Modern Language Association. -- Popular Culture Section.   2 items
   Midwest Museums Conference   2 items
   Mifflin Avenue United Methodist Church (Wilkinsburg, Pa.)   2 items
   Mifflin United Presbyterian Church (West Mifflin, Pa.)   1 item
   Miles Inc.   2 items
   Military Order of the Loyal Legion of the United States. -- Minnesota Commandery   2 items
   Military Training Association of Pittsburgh.   2 items
   Mill Creek Presbyterian Church (Greene Township, Beaver County, Pa.)   2 items
   Mill Creek Valley Historical Association.   2 items
   Mill Site Tavern (South Side, Pittsburgh, Pa.) -- Photograph.   2 items
   Miller Homestead (South Park, Allegheny County, Pa.)   2 items
   Miller Printing Equipment Co. (Pittsburgh, Pa.)   2 items
   Miller Printing Machinery Company (Pittsburgh, Pa.)   2 items
   Miller's Wonder Store (Pittsburgh, Pa.)   2 items
   Million Dollarova Sbierka.   2 items
   Milton D. Hays Company. -- pbl   2 items
   Mine Safety Appliances Company   4 items
   Minersville Cemetery (Pittsburgh, Pa.)   2 items
   Minerva Theatre (Pittsburgh, Pa.)   2 items
   Mingo Presbyterian Church (Finleyville, Pa.) -- Anniversaries, etc.   2 items
   Mingo Presbyterian Church (Finleyville, Pa.) -- History.   2 items
   Mininsterial Relief Association of the Pittsburgh and EFast Ohio Conference.   2 items
   Ministerial Association of Seventh-Day Adventists.   1 item
   Minnesota Historical Society   16 items
   Minnesota Historical Society -- Periodicals.   2 items
   Minnesota Historical Society -- Pictorial works.   2 items
   Minnesota History Center (Saint Paul, Minn.)   2 items
   Minnesota Mining and Manufacturing Company.   2 items
   Miss Pitsburgh (airplane)   2 items
   Miss Pittsburgh (airplane)   8 items
   Miss Simonson's School (Pittsburgh, Pa.)   2 items
   Miss Youngstown (airplane)   2 items
   Misses Masters School Society of Pittsburgh   2 items
   Mission Helpers of the Sacred Heart   2 items
   Mission Helpers of the Sacred Heart -- History.   2 items
   Mississippi Library Commission. -- Biennial report.   2 items
   Mississippi State Library. -- Report.   2 items
   Mississippi State University   2 items
   Mississippi Valley Historical Association   6 items
   Mississippi Valley Historical Association. -- Proceedings. -- Indexes.   2 items
   Mississippi. -- Dept. of Archives and History.   2 items
   Missouri Historical Society -- Periodicals.   2 items
   Missouri Historical Society.   2 items
   Mister Hot Dog (Pittsburgh, Pa.)   2 items
   Mitchell, Stevenson and Co. (Pittsburgh, Pa.)   1 item
   Mizrachi Zionist Association.   4 items
   Mizrachi.   2 items
   Mizrahi Organization of America.   2 items
   Mizrahi Zion Council   2 items
   Mkhit`arean Miabanut`iwn i Venetik.   2 items
   Mobot, Inc. (Pittsburgh, Pa.)   2 items
   Modern Language Association of America. -- American Literature Group. -- Committee on Manuscript Holdings. -- American literary manuscripts.   2 items
   Modern Language Association of America. -- American Literature Section   2 items
   Modern Language Association of America. -- Division on Black American Literature and Culture   2 items
   Modern Language Association of America. -- Popular Literature Section.   2 items
   Modern Woodmen of America   2 items
   Moffitt Mine (Point Marion, Pa.) -- Photographs.   2 items
   Mon Valley Commission.   2 items
   Mon Valley Education Consortium.   2 items
   Mon Valley Media   2 items
   Mon Valley Network.   2 items
   Mon Valley Steel Heritage Museum.   2 items
   Mon Valley Stel Heritage Museum.   2 items
   Mon-Valley Unemployed Committee.   2 items
   Monaca Bridge (Pa.) -- Pictorial works.   2 items
   Monaca Land Company.   2 items
   Monday Class.   2 items
   Monday Lunch Club (Pittsburgh, Pa.)   2 items
   Monday Luncheon Club (Pittsburgh, Pa.)   2 items
   Monongahela Bank of Brownsville (Pa.)   2 items
   Monongahela Bridge (Pittsburgh, Pa.)   6 items
   Monongahela Bridge Company (Pittsburgh, Pa.)   2 items
   Monongahela House (Pittsburgh, Pa.)   3 items
   Monongahela Incline (Pittsburgh, Pa.)   8 items
   Monongahela Inclined Plane Company (Pittsburgh, Pa.)   2 items
   Monongahela Light Dragoons.   2 items
   Monongahela National Bank (Brownsville, Pa.)   2 items
   Monongahela National Bank (Brownsville, Pa.) -- History.   2 items
   Monongahela National Bank (Pittsburgh, Pa.)   2 items
   Monongahela Navigation Company   8 items
   Monongahela Railway Company.   2 items
   Monongahela River Consolidated Coal and Coke Company   2 items
   Monongahela River Lock and Dam No. 7.   2 items
   Monongahela River Packet Company (Pittsburgh, Pa.)   2 items
   Monongahela River Symposium (Brownsville, Pa.)   2 items
   Monongahela River Valley Heritage Park (Pa.)   2 items
   Monongahela Turners (Pa.)   2 items
   Monroeville Junior High School (Pa) -- Students -- Yearbooks.   2 items
   Montague Mailing Machinery Company (Pittsburgh, Pa.)   2 items
   Montana Historical Society.   4 items
   Montefiore Aid Society (Pittsburgh, Pa.)   4 items
   Montefiore Hospital (Pittsburgh, Pa.)   32 items
   Montefiore Hospital (Pittsburgh, Pa.) -- School of Nursing -- Students -- Yearbooks.   2 items
   Montefiore Hospital Association (Pittsburgh, Pa.)   4 items
   Montefiore Hospital Association of Western Pennsylvania.   2 items
   Montefiore Hospital. -- School of Nursing.   2 items
   Montez and Adele (Dancing team)   4 items
   Montgomery Blues.   1 item
   Montgomery Ward.   2 items
   Monticello (Va.)   4 items
   Montour High School (Irwin, Pa.) -- Students -- Yearbooks.   2 items
   Montour Presbyterian Church (Robinson Township, Pa.)   2 items
   Montours Presbyterian Cemetery (Robinson (Township : Allegheny County,Pa.))   1 item
   Moon (Pennsylvania : Township) -- Board of Supervisors.   2 items
   Moon Lorn (House)   2 items
   Moon Township High School (Pa.) -- Students -- Yearbooks.   2 items
   Moonlight Mushr